Iran's Foreign Ministry spokesman also said Tehran would respond in an "appropriate and timely" way to any change in U.S. behaviour towards the country.

Iran has reacted cautiously to Obama's election victory, saying it is waiting to see whether his presidency will herald real change in U.S. foreign policy.

Obama, who takes office on Jan. 20, last week said on Sunday he will take "a new approach" toward Tehran.

"We have to see whether or not this change in orientation (by Obama) is in practice and whether it will bring about fundamental change in the behaviour and stance of America in relation to Iran," Foreign Ministry spokesman Hassan Qashqavi told a news conference.

He said Obama should not "repeat past statements and instances whose falsehood has been demonstrated by Iran," a reference to U.S. accusations about Tehran's nuclear program and other issues -- although he did not mention specific charges.

"This is a very important point and undoubtedly Iran will undertake an appropriate and timely measure proportionate with the new U.S. behaviour and action," Qashqavi said.